A '''wormhole''' or '''Einstein-Rosen Bridge''' is a hypothetical topology|topological
feature that would fundamentally be a shortcut connecting two separate points in spacetime
. A wormhole, in theory, might be able to connect extremely far distances such as a billion light years or more, short distances such as a few feet, different universes, and different points in time. A wormhole is much like a tunnel with two ends, each at separate points in spacetime.
For a simplified notion of a wormhole, space
can be visualized as a two-dimensional (2D) surface. In this case, a wormhole would appear as a hole in that surface, lead into a Three-dimensional space (mathematics)|3D
tube (the inside surface of a cylinder), then re-emerge at another location on the 2D surface with a hole similar to the entrance. An actual wormhole would be analogous to this, but with the spatial dimensions raised by one. For example, instead of circular holes on a 2D plane, the...